Shanghai stock market index results are seen as people walk over a bridge at the financial district of Pudong in Shanghai June 4, 2012. The Shanghai stock market fell a bizarre 64.89 points on Monday, the anniversary of the bloody crackdown on protesters in Tiananmen Square on June 4, 1989, or 6-4-89. Experts say it is most likely a coincidence.

Carlos Barria/Reuters

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SHANGHAI

China's share benchmark has fallen afoul of the country's Internet censors by appearing to mark the 23rd anniversary of the Tiananmen Square crackdown on pro-democracy protesters.

In an unlikely coincidence certainly unwelcome to China's communist rulers, the stock benchmark fell 64.89 points Monday, matching the numbers of the June 4, 1989 crackdown in the heart of Beijing.

In Beijing, the anniversary passed without any major sign of protest. The front page of the party newspaper People's Daily trumpeted the "Stable, fast development of the Chinese economy: Advancing to be the World's No. 2."

The melee as soldiers fought their way into Beijing to clear Tiananmen Square is believed to have left hundreds dead. In response to the violence in the capital, demonstrations erupted in more than 180 cities and in some cases were quelled violently.

The government has never provided a credible accounting of the number of victims or arrests in the sweeping crackdown that followed.

Asked at a regular briefing if the government had changed its stance regarding the "June 4 issue" Foreign Ministry spokesman Liu Weimin said, "I just knew you would ask this question."

"The political case you mentioned was concluded long ago by the ruling party and government," he said, objecting to a U.S. State Department call for a reconsideration of the party's stance as "rude interference in China's internal affairs."